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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd9f902a8767c1af375767dfe9aa689207ae9a7740ba85a6db443b073077b80' 
  AND token = 'cbup0a4f+zpcEfER7GAk1Jx6yllRyp/85uMgPu0oMRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}